Hi,
PlayMaker certainly works with MultiPlayers environment, I even wrote a server side Physics scene that runs on a headless Unity on EC2 Amazon, and all is driven by PlayMaker.
However, to work with Force networking specifically, you'll need to write custom actions and components to "connect" PlayMaker and Forge together. Typically, this is an involving process and requires good understanding of both PlayMaker and Forge to dive into this.
Currently, Exitgames Photon networking system is what I recommend using because I maintain this properly.
http://j.mp/1IIXNRSI created a demo scene with all documentations so you can study and learn how to work with Photon and PlayMaker.
If you must use other technology, and don't have the necessary c# skills to work it out, I would contact the publishers and see if they are willing to support PlayMaker.
also, since PlayMaker Fsm are not scripts per say, but logic being executed at runtime, I am pretty sure you can submit an app with bundles actually featuring fsm's.
Technically, this is fine.
Bye,
Jean